JP2011188759A - Lawn vegetation base material, method for producing the same, and lawn vegetation base - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn vegetation base whose proper strength as the ground is ensured, which hardly causes soil consolidation due to tread pressure to be excellent in water permeability, and also which is excellent in water retention/fertilizer retention so that lawn hardly causes degeneration/dying down. <P>SOLUTION: The lawn vegetation base 1 having a thickness of ≥15 cm is constructed as follows: reducing components having a grain size of larger than 0.1 mm and 1.5 mm or smaller from soil containing gravel fractions, sand and clay/silt; admixing inorganic substance and organic substance for enhancing the water retention or the fertilizer retention to the soil so as to adjust the whole grain size structure to have ≥70 wt.% of a component with the grain size of larger than 2 mm and 75 mm or smaller, ≥10 wt.% of a component with the grain size of ≤0.075 mm, ≤15% of a component with the grain size of larger than 0.1 mm and 1.5 mm or smaller to make the lawn vegetation base material; evenly paving the lawn vegetation base material 2; and subjecting the base material to surface compaction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lawn vegetation base material, a method for producing the same, and a lawn vegetation base.

  Greening by lawn is expected to spread further because it has the effects of suppressing the rise in ground temperature (preventing heat islands, preventing global warming), delaying the surface runoff time of rainwater, and preventing dust from rising. . Conventional greening by lawn will be described separately for a parking lot that receives a large treading pressure by a car and a general plaza such as a ground that receives a small treading pressure by a person.

(1) As shown in FIG. 2, the greening by the lawn of a parking lot generally used the lawn protective material 50 made of resin (Patent Document 1). This lawn protective material 50 is formed by connecting columnar pressure receiving bodies 51 arranged at lattice point positions in a plan view with plate-like connecting portions 52. As shown in FIG. 1 (b), the crushed stone 54 is laid on the excavation site 53 to a thickness of about 15 cm, and the sand cushion 55 is laid on the crushed stone 54 to a thickness of about 2 cm. The lawn protective material 50 is placed side by side, and the soil 56 is put in the space between the pressure receiving body 51 and the connecting portion 52 so as to be slightly lower than the pressure receiving body 51, and the lawn 57 is stretched on the soil 56. At the same time, the upper surface of the pressure receiving body 51 is exposed from the hole provided in the lawn 57, and the soil 56 is rolled from above the lawn 57. After the construction, a large stepping pressure by the automobile is received by the upper surface of the pressure receiving body 51, so that the lawn 57 can be protected.

However, greening by lawn using this lawn protective material 50 has the following problems.
(A) Lawn has a limit soil thickness of 30 cm for growing and a limit soil thickness of 15 cm for survival. The product thickness (height of the pressure receiving body 51) of the lawn protective material 50 is about 7 cm. Therefore, the customer soil 56 that is the soil for growing the lawn has only a product thickness of 7 cm. For this reason, the lawn does not grow, and the lawn is very often deteriorated or withered over time.
(B) Moreover, since the mutual space | interval of the pressure receiving body 51 of the said lawn protective material 50 is as small as about 8 cm, it is a structure which is difficult to lay the customer soil 56 uniformly, and is hard to apply a rolling pressure uniformly. For this reason, it is easy to sink unevenly after the fact and rain water is stagnation, which also causes the lawn to degenerate and die.

(2) In the greening of lawns in general squares, the treading pressure by humans is small, and it is not necessary to use the lawn protective material 50. Therefore, the customer soil that is the base of the lawn should have a sufficient soil thickness of 15 cm or 30 cm. Can do. However, in normal customer soil, soil consolidation also occurs due to human treading pressure, and it tends to have soil hardness that prevents the roots of the lawn from growing. For this reason, maintenance management such as aeration is indispensable, but many lawn plazas are not properly managed, and lawns often degenerate.

JP-A-10-295201

  Therefore, the problem of the present invention is that it can secure an appropriate strength as the ground, is less likely to cause soil consolidation due to treading pressure, is excellent in water permeability, is excellent in water retention and fertilizer retention, and is resistant to lawn degeneration and death. It is to provide a lawn vegetation base material and a lawn vegetation base that are difficult to occur.

In order to solve the above-mentioned problems, the present invention has been achieved through the following studies.
In order to create a lawn that can be used as a parking lot, the following conditions are preferably satisfied.
1. 1. The ratio of CBR as the ground (JIS A 1211, the larger value of CBR at the penetration amount of 2.5 mm and 5.0 mm) should be ensured to be 20% or more. Soil that has water retention, fertilization and water permeability that allows lawn to grow and has voids that allow roots to grow (hard to consolidate)

  Basically, general soils are from gravel (with a particle size of more than 2 mm to 75 mm or less) to sand (with a particle size of more than 0.075 mm to less than 2 mm) and clay / silt (with a particle size of less than 0.075 mm). ) Evenly, and is widely used as embankment material, can be sufficiently compacted, and CBR can be easily secured. However, soil solidification is likely to occur due to treading pressure, and grass roots are difficult to extend. Conversely, sand with a uniform particle size or single-grain crushed stone is unlikely to solidify due to treading pressure, and the roots of the lawn tend to stretch, but the water retention and fertilization properties are inferior and compaction is impossible, so cars are not allowed to pass. Then it moves.

  The present inventor pays attention to the particle size distribution of the soil, and by removing the intermediate portion in the particle size distribution, CBR as the ground can be secured, and soil with excellent water permeability is obtained that is hard to cause soil solidification due to treading pressure. In addition, the present inventors have found that a vegetation soil excellent in water retention and fertilization properties can be obtained by mixing an inorganic substance and an organic substance in place of the deleted intermediate portion.

That is, the means for solving the above-described problems are as follows.
(1) Including gravel, sand and clay / silt, inorganic and organic substances are mixed to increase water retention or fertilizer retention, and the total particle size composition is 70 wt. A lawn vegetation base material in which components of not less than 10% and not more than 0.075 mm are adjusted to not less than 10% weight and components of not less than 0.1 mm to not more than 1.5 mm are adjusted to not more than 15%.

(2) An inorganic substance and an organic substance for reducing a component having a particle size of more than 0.1 mm to 1.5 mm or less from soil containing gravel, sand and clay / silt, and enhancing water retention or fertilizer retention in the soil Thus, the total particle size constitution is 70% by weight or more for components greater than 2 mm to 75 mm or less, 10% by weight for components less than 0.075 mm, and 15 for components greater than 0.1 mm to 1.5 mm or less. A method for producing a lawn vegetation base material, characterized in that the vegetation base material is adjusted to be equal to or less than%.

(3) A lawn vegetation base having a thickness of 15 cm or more by spreading and rolling the lawn vegetation base material.

  Here, as described above, the gravel content has a particle size of more than 2 mm to 75 mm or less, the sand content has a particle size of more than 0.075 mm to 2 mm or less, and the clay / silt content has a particle size of 0.075 mm or less. is there.

  Examples of the inorganic material include calcined foundry sand, carbonized sludge, crushed roof tile and the like, and it is preferable to mix at least one selected from these. Firing foundry sand is obtained by firing waste foundry sand and mainly improves water retention. Carbonized sludge is obtained by carbonizing sludge (sludge produced in the treatment of sewage or factory waste liquid) at high temperature, and mainly increases water retention. The crushing roof tile is a waste roof tile crushed into particles, and mainly improves water retention and pressure resistance.

  Examples of organic substances include compost (eg, bark compost), medicinal herbs, and humus, and it is preferable to mix at least one selected from these.

  According to the lawn vegetation base material and the lawn vegetation base of the present invention, it is possible to ensure an appropriate strength as the ground, and it is excellent in water permeability and resistance to soil consolidation due to treading pressure, and also in water retention and fertilizer retention. It is possible to obtain an excellent effect that the lawn is unlikely to deteriorate or die.

(A) is sectional drawing which shows the lawn vegetation base of an Example, (b) is sectional drawing of the protective work using the conventional lawn protective material. (A) is a top view of the conventional lawn protective material, (b) is the side view.

  Ingredients with a particle size of more than 0.1mm and less than 1.5mm are reduced from the soil containing gravel, sand and clay / silt, and the soil is mixed with inorganic and organic substances to improve water retention or fertilizer retention. Therefore, the overall particle size constitution is such that the component of 2 mm to 75 mm or less is 70% by weight or more, the component of 0.075 mm or less is 10% by weight or more, and the component of 0.1 mm to 1.5 mm is 15% or less. The lawn vegetation base material is adjusted so that the lawn vegetation base material is spread, and the lawn vegetation base material is spread and pressed to construct a lawn vegetation base having a thickness of 15 cm or more.

  The pure sand soil (commonly known as mackerel soil) produced in Seki City, Gifu Prefecture is a soil that contains gravel, sand, clay and silt evenly, sifted through this soil, and particle sizes above 0.1mm to 1.5mm or less. The component of 40% by weight was deleted. The maize soil after the deletion treatment was mixed with an inorganic substance and an organic substance at the following blending ratio to obtain a lawn vegetation base material.

Mackerel soil 78% by weight
Firing foundry sand (inorganic material: biotope sand) 5% by weight
Carbonized sludge (inorganic material: carbo sand) 5% by weight
Shattered roof tile (inorganic material: lutea gate) 8% by weight
Bark compost (organic) 4% by weight

  Biotope sand is a trade name of ACRECO Co., Ltd., and is obtained by firing waste foundry sand. Carbo Sand is a trade name (registered trademark) of Create Corporation, and is a product obtained by carbonizing a waste paper sludge at a high temperature. Luteia Gate is a trade name (registered trademark) of Shunzen Sangyo Co., Ltd., which is a waste roof tile crushed into fine particles.

  When the particle size distribution of the obtained lawn vegetation base material was examined, components having a particle size of more than 2 mm to 75 mm or less were 74.9% by weight, components having a particle size of more than 0.075 mm to 2 mm or less were 13.1% by weight, and a particle size of 0.1%. A component having a particle size of 075 mm or less was 12.0% by weight, and particularly a component having a particle size of more than 0.1 mm to 1.5 mm or less was 11.0% by weight.

Using the obtained lawn vegetation base material, a lawn vegetation base 1 was constructed as shown in FIG.
That is, the crushed stone 4 is laid about 15 cm thick on the excavation site 3 scheduled for the parking lot, the lawn vegetation base material 2 obtained above is laid on the crushed stone 4 to a thickness of 15 cm or more, and the lawn vegetation base The material 2 was rolled with a 3-ton roller car to form a lawn vegetation base 1 having a thickness of 15 cm, and lawn 7 (specifically, Tifton turf and korai turf) was spread on the lawn vegetation base 1.

In addition, it was as follows when the various properties of the lawn vegetation base 1 after the said rolling compaction were measured on site or sampled. The permeability coefficient was measured in accordance with JIS A 1218 “Soil permeability test (variable water level)” (for specimen preparation and saturation method, created by JSF T 711 nominal name A with 25 tamped times). CBR was measured according to the method described in paragraph 0008.
Water permeability 6.32 × 10 ⁻⁴ cm / sec CBR 29.7%
pH 6.5-7.5

  The parking lot that was greened by the lawn 7 was observed over time while actually being used as a parking lot. Almost no soil solidification occurred, and no degeneration or mortality of the lawn was observed. This is because the lawn vegetation base 1 with the particle size distribution adjusted as described above has an appropriate strength as the ground, and is less likely to cause soil consolidation due to treading, and has excellent water permeability, and is a mixture of inorganic and organic substances. This is considered to be because of excellent water retention and fertilization. Moreover, it is because the lawn vegetation base | substrate 1 can fully be taken, without requiring the resin lawn protective material 50 like the past.

The present invention is not limited to the above-described embodiments. For example, the present invention can be appropriately modified and embodied as follows without departing from the spirit of the invention.
(1) In Examples, only one of calcined foundry sand, carbonized sludge and crushed tile, or two types of calcined cast sand and carbonized sludge, two types of calcined cast sand and crushed tile, carbonized sludge, Two types of crushed roof tiles can be mixed and carried out.
(2) The lawn vegetation platform 1 can be implemented in places other than the parking lot, for example, a general lawn open space where the treading pressure is lower than the parking lot, and it goes without saying that the same effect can be obtained.

1 Lawn Vegetation Base 2 Lawn Vegetation Base 3 Excavation Site 4 Crushed Stone 7 Lawn

Claims (3)

  Including gravel, sand and clay / silt, inorganic and organic substances are mixed to increase water retention or fertilization, and the overall particle size composition is more than 70% by weight of components of 2 mm to 75 mm. A lawn vegetation base material in which a component of 0.075 mm or less is adjusted to 10% weight or more and a component of more than 0.1 mm to 1.5 mm or less is adjusted to 15% or less.   Ingredients with a particle size of more than 0.1mm and less than 1.5mm are reduced from the soil containing gravel, sand and clay / silt, and the soil is mixed with inorganic and organic substances to improve water retention or fertilizer retention. Therefore, the overall particle size constitution is such that the component of 2 mm to 75 mm or less is 70% by weight or more, the component of 0.075 mm or less is 10% by weight or more, and the component of 0.1 mm to 1.5 mm is 15% or less. A method for producing a lawn vegetation base material, characterized by being adjusted to be.   A lawn vegetation base having a thickness of 15 cm or more obtained by spreading and rolling the lawn vegetation base material according to claim 1.

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